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Title: Extending carbon chemistry at high-pressure by synthesis of CaC2 and Ca3C7 with deprotonated polyacene- and para-poly(indenoindene)-like nanoribbons

Journal Article · · Nature Communications
 [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [3];  [1]; ORCiD logo [1]; ORCiD logo [3];  [3];  [4];  [5]; ORCiD logo [5]; ORCiD logo [2];  [6];  [6];  [7]; ORCiD logo [1]; ORCiD logo [7]
  1. Univ. of Bayreuth (Germany)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. Univ. of Cologne (Germany)
  4. Goethe Univ., Frankfurt (Germany)
  5. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  6. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  7. Linköping University (Sweden)

Metal carbides are known to contain small carbon units similar to those found in the molecules of methane, acetylene, and allene. However, for numerous binary systems ab initio calculations predict the formation of unusual metal carbides with exotic polycarbon units, [C6] rings, and graphitic carbon sheets at high pressure (HP). Here we report the synthesis and structural characterization of a HP-CaC2 polymorph and a Ca3C7 compound featuring deprotonated polyacene-like and para-poly(indenoindene)-like nanoribbons, respectively. We also demonstrate that carbides with infinite chains of fused [C6] rings can exist even at conditions of deep planetary interiors (~140 GPa and ~3300 K). Hydrolysis of high-pressure carbides may provide a possible abiotic route to polycyclic aromatic hydrocarbons in Universe.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2470111
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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